Solve the system need help ASAP

4+6x-3x^3 in standard form with explanations because i don’t understand

Fiona and her friends are playing a game by guessing where a coin will land when it is randomly dropped inside the square shown below. fiona guesses that the coin is likely to land in the blue area. which explains whether or not fiona is correct and why?

Find the number of liters in 12.8 gal of gasoline. round to the nearest hundredths